package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {
   // 因为这个类不是由spring创建的，所以需要用构建函数注入依赖

    private StringRedisTemplate redisTemplate;
    @Autowired
    public RefreshTokenInterceptor(StringRedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取请求头中的token
        String token = request.getHeader("authorization");
        System.out.println("token: " + token);
        // 1.1判断token是否为空
        if (StrUtil.isBlank(token)) {
            return true;
        }
        // 2. 基于token获取用户信息 不用判断是否为空，因为entries方法会判断是否为空
        Map<Object, Object> userMap = redisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        // 3.判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }
        // 5.将查询到的hash数据转换为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        // 6.存在。保存用户信息到threadLocal中
        UserHolder.saveUser(userDTO);
        // 7.刷新token有效期
        redisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }
}
